Improvement



G. F. GREEN.

ELEcTno MAGNETIQFAN.V

N0.171,1ZZ. Patented Dec.14, 1875.

` 1D t T uw cured to its poles.

CINITEE STATES PATENT OFFICE.,

GEoEGE E. GREEN, or KALAMAZoo, MICHIGAN, AssIGNoE To SAMUEL s.

WHITE, or PHILADELPHIA, PENNSYLVANIA.

IMPRDVEMENT EN ELECTRO-MAGNETIC FNS.

Specihcation forming part of Letters Patent No. l 71,122, dated December14, 1875; application iled August 5, 1873.

GAsE G.

To all whom it may concern:

Be it known that I, GEORGE F. GREEN, of Kalamazoo, Michigan, haveinvented a certain new and useful Application of Power from anElectro-Magnetic Motor, of which the following is a specification Myinvention relates more especially to the automatic vibration of fansused during the performance of dental operation. Its objects are tosecure a fan which may easily be adjusted in any desired position, andwhich may be worked byelectro-magnetism. The subjectmatter claimed ishereinafter specified.

The accompanying drawing represents a viewin perspective of myiinprovedapparatus. Through a base, B, I insert the stem d of a hollow metallicbracket, D, which turns horizontally on this stem over the base in anydirection. Into the upper extremity of the bracket D I slide a stud, e,from which I project an elbow, f, with a clamp-joint, Gr, connecting itto a permanent magnet, E, which is uphold by the clamp-joint G, on whichit is free to turn upward and downward, or the clamp may be iiXed at anyadjusted position by means of thejam-nutc upon it. The magnet may alsobe turned around in any horizontal direction, as the stud e is free toturn in the bracket D, and in any of these positions may be fixed by theset-screw h. Iinsulate the magnet E from the bracket D by interposingbetween thejam-nut U and the elbow fa washer of non-conducting material,such as rubber or pasteboard, for example. On the side of the magnet Eopposite thejoint G I solder a step, which affords a bearing for thelower end of a shaft, I. Between the poles of the magnet E I mount anelectro-magnet, F, on a spindle, j, the lower end of which has a bearingin thebottom ofthe magnetE, while its upper end passes through and issustained in the arm t' of an open metallic frame, H, which extendsacross the magnet E and is se- 'Ihe magnet F is thus free to rotatebetween the poles of the magnet E. The upper end of the spindlej carriesa pinion, 7c, between the arm i and the magnet F, and this pinion meshesinto a gear-wheel, K,

supported on a shaft, l, the lower end of which is supported in theframeH, and its upper end, as well as the upper end of the shaft I, supportedin a cross-brace, M, which is in turn braced by being screwed down uponthe stirrup N, which is mounted on the frame H. Near the upper end ofthe shaft I, which is pivoted in this cross-brace N, I solder a bentarm, I in the upper end of which I provide a socket, O, for thefan-shaft P, the fanshaft being securely held in this socket by means ofa set-screw, which permits the shaft to be slipped in or out as desired.The open fan R is secured in a vertical position to the outer end of theshaft. Upon the upper end of the shaft Z, which projects through andabove the cross-brace M, I mount a crank-wheel, S, and connect to thewrist-pin of this crank one end of a exible or extendibleconnecting-rod, T, which is curved upward to admit of the crankwheelpassing under it, and also to allow a spiral spring to be coiled aroundthe connectin g-rod. The end of this connecting-rod passes througl'i aneye in one end of a short link, u, and in the other end of this link isa wrist-pin, which is fastened in the rear end of a long crank, w, theforward end of this crank w being brazed around the crooked shaft N. Thesmall crank g is rotated by the power of the battery, and as it rotatesit operates the long crank w through the connectin g-rod t and link u,and through this connection the shaft N is vibra-ted, but not rotated,and thefan is swayed to and fro.

The power of the battery is transmitted from the wires ca and thebracketl) through the binding-posts y y and metallic contacts betweenthem and the spindlej (as is well understood) to the electro-magnet F,which rotates between the poles of the permanent magnet E, and theelectro-magnet rotates the pinion-shaft j and pinion k, and through itthe gear-wheel K on the shaft l, which carries the crank and transmitsthe motion just described to the fan.

To admit of the intermission of the operation of theA fan withoutdisconnecting the wires a a', I providea circuit-breaker, C, which c011-sists of a metallic arm pivoted on the base IB, and thus connected atone end with the oireuit, which it keeps closed so long as it rests incontact with the stud c connected with the Wire a', as alreadydescribed. When this arm is lifted frointhe stud c the circuit isbroken, the arrangement and operation being such as is Well understoodby electricians in the eategory of telegraphic switches.

I claim as my inventionl. The combination, substantially as hereinbeforeset forth, of the rotating electro-magnet, its gearing, the fan-shaft,crossbra-ce M, and the cranked pitinan-connections between the fan-shaftand gearing, whereby the fan is vibrated by the rotation of the magnet.

2. The combination of the fan. the electromagn et, and its adjustablesupportin g-braoket, through Which the circuit passes; these membersbeing` constructed and operating in combination7 substantially ashereinbefore set forth.

3. rllhe combination, substantially as set forth, of the electro -motor,the adjustable bracket, and the circuitbreaking lever, through which thecurrent passes to the bracket.

4. vThe combination of the horizontally adjustable bracket, theeleotromagnet, and the insulated vertically-adjustable joint between thebracket and magnet.

In testimony whereof I have hereunto subscribed my naine.

GEORGE F. GREEN. Witnesses:

` LEVI TEAL,

WM. E. MORGAN.

